There might not have been a third season, as NBC was thinking about canceling Chuck due to its low ratings, if it hadn't been for the fan-generated Save Chuck campaign. This was the beginning of Subway's sponsorship deal with the show.

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After downloading the Intersect 2.0, Chuck finally chooses to be a spy, to Sarah's chagrin. Six months later after failing spy school, he is fired from the CIA and also lost the love of his life. CIA Agent Daniel Shaw takes over Team Bartowski to aid Chuck's journey into becoming a spy.

However, things take a turn when Sarah's first kill is revealed as Evelyn Shaw - wife of Daniel Shaw, and the Ring takes hold of the CIA and NSA.